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Celery stalks that are immersed in fresh water for several hours become stiff. Which of the following statements best explains the observation that similar stalks left in a very salty solution become limp?

A polysaccharide molecule is composed of __________ monosaccharides joined together.

Unsaturated fats are usually a liquid at room temperature.

  Instructions:   The 4 questions in this exam are below. Suggested time is about 20 minutes per question.                  

Tables:  

What do increasing levels of prostaglandins and relaxin contribute to during pregnancy?

Trade-offs force society to make choices when answering what three fundamental questions? 

After having her first child, a 25-year old patient wants to know how long she should wait before trying to conceive again.  Using current evidence and research, what is the optimal pregnancy spacing interval to discuss with the patient?

A 46-year-old patient presents for a well woman exam and desires a reversible contraceptive method with the highest effectiveness rate to prevent pregnancy.  She has a BMI of 24 and has no chronic medical conditions.  Which option is the best response?

Refer to the Figure above. If the economy is currently producing at point X, what is the opportunity cost of moving to point W?